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On the Fine Structure of Meteoritical Taenite/Tetrataenite and its Interpretation

1983; IOP Publishing; Volume: 27; Issue: 4 Linguagem: Inglês

10.1088/0031-8949/27/4/015

1402-4896

Jörg Albertsen, Hanne Philbert Nielsen, Vagn F. Buchwald,

Geological and Geochemical Analysis

Taenite fields from several meteorites have been investigated by TEM, Electron microprobe and Mössbauer spectroscopy. The investigations have disclosed a delicate pattern of antiphase domains in the tetrataenite and the presence of low-Ni taenite at the antiphase boundaries, in what was hitherto believed to be pure tetrataenite. The observations indicate that the "cloudy taenite" (cloudy zone II) was formed by a magnetically induced spinodal decomposition of the metastable taenite during slow cooling below 400°C.